18089871 has 8 divisors (see below), whose sum is σ = 24146304. Its totient is φ = 12046680.

The previous prime is 18089867. The next prime is 18089893. The reversal of 18089871 is 17898081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18089871 - 2² = 18089867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18089171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510 + ... + 6036.

It is an arithmetic number, because the mean of its divisors is an integer number (3018288).

Almost surely, 2^18089871 is an apocalyptic number.

18089871 is a deficient number, since it is larger than the sum of its proper divisors (6056433).

18089871 is a wasteful number, since it uses less digits than its factorization.

18089871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6621.

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 18089871 is about 4253.2188986696. The cubic root of 18089871 is about 262.5095796957.

The spelling of 18089871 in words is "eighteen million, eighty-nine thousand, eight hundred seventy-one".